Medical uses. Warfarin is used to decrease the tendency for thrombosis or as secondary prophylaxis (prevention of further episodes) in those individuals who have already formed a blood clot. Warfarin treatment can help prevent formation of future blood clots and help reduce the risk of embolism (migration of a thrombus to a spot where it. There are no specific recommendations against drinking alcohol while you take warfarin, but alcohol can affect how warfarin works. It slows down how quickly your body breaks down warfarin. Foods containing vitamin K affect how Coumadin works. Green leafy vegetables contain a high level of vitamin K. Increased consumption of vitamin K containing foods decrease the blood thinning effect of Coumadin. SM says: November 7, 2011 at 10:37 AM. A cousin has A Fib and is on Pradaxa…how does drinking alcohol affect one on Pradaxa? She drinks vodka and Coke daily and often heavily but has done so for a long time and never been honest with her doctors about the amount of her consumption. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Lang on does alcohol affect potassium levels: Check out . What can change the effect of warfarin? “DIME” • D - Diet changes - green vegetables can affect your INR - but don’t stop eating them. Just try to eat the same amount every week Using warfarin together with ethanol can cause you to bleed more easily. If you take warfarin you should avoid large amounts of alcohol, but moderate consumption (one to two drinks per day) are not likely to affect the response to warfarin if you have normal liver function. What about alcohol? Alcohol can affect the way warfarin works in your body, and alcohol by itself can increase your bleeding risk. Although it is best to avoid alcohol while taking warfarin, limited amounts (no more Using warfarin together with ethanol can cause you to bleed more easily. If you take warfarin you should avoid large amounts of alcohol, but moderate consumption (one to two drinks per day) are not likely to affect the response to warfarin if you have normal liver function. NHS medicines information on warfarin – what it’s used for, side effects, dosage and who can take it.